{
  "manageEntity": {
    "action": "Save",
    "entityId": "204288147",
    "entityType": "Track",
    "nonce": "0x298a08de8df9ff05c2ac6cb9fa7c9e0de2605208034fb181cea60847a3b19a25",
    "signature": "0x6bb30fdc2852100fc952268ea69fee680342c9618b3c95c04c1c294f67515a605de24b26749a6b1a079ab4630c88d4dcc9c3af4a3f1547544ddf10729ffeef6b1b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}